Spiritual Reformers in the 16th & 17th Centuries by Rufus M. Jones examines a number of religious thinkers and reformers who challenged established traditions and sought a more inward, experiential, and spiritually centered form of Christianity. Jones places these figures within the religious and intellectual upheavals of early modern Europe.

The work explores the development of mystical and spiritual movements during the sixteenth and seventeenth centuries, highlighting ideas concerning personal faith, conscience, divine guidance, religious freedom, and direct spiritual experience. It provides a historical study of important currents that influenced later developments in Christian mysticism, Quakerism, and other forms of spiritual reform.